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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d9cb2be4e6725567b380477f0141f69d01574443014a362192b08af673750f2' 
  AND token = 'Q8z/NyOPXbwllAGyfzh4VM/bV9w8zCss98teJaidMBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}