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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0a1e9d322de471df6b2717e9b6691a2ddcbfc9b7d5a79fbb66e5974796df15a' 
  AND token = 'RpQ6JKOy3wExK4vN7Ld2vx7tyvSBxMMGRNCk7OC9ruM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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