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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd548a38dc9ce5dac2a7ad01020c3ee705a1b70da6acf2be6b69764d69638d249' 
  AND token = 'StHCj/AFyi/6H01o/q9AktOdPCTe96/rdt9Lnv7hDWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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