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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb2017f8e1ee345a657e0f17b26bd81eab489693f095d86d431bd5a94f464fa1' 
  AND token = 'MaeHAQbKma7/z3VuySKvBDPuUL/MZ9mYAWDmF3SqPe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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