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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad790bba6633b54d2a65e9c848fb4615f2b25330ede7277d1ea0773f22fe4160' 
  AND token = 'aAz0e+Gzyg9grVYIBTtiTNe37of8vW0oW3FB6d1eT3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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