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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c06e9af6677fa2a93475ebec894a3e6b1aeb1ec470d5fa86523529e0358eba6' 
  AND token = 'M3Tm+eZ7byDb2k5kf66Um2bapU2zixPqMERez61NN9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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