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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8858b036bdf0dd4feefe450445bb0422e0d76139c36f6df59df72e0fc093476' 
  AND token = '8AwyuClK1AHS4Su0pjKg29jwjmipyrqYF6En6H0nnP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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