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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de66e30c0e99e6c82058eeca3db6e7b8b494b3f24aae41fe7d050dbe556300f7' 
  AND token = 'c5kTK6dd4ROCShFegADSwoq40GyUNMm/2c29QKocY2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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