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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a14d9186878a509e83ca7a1f5623fa2e271820fe4f0fc3d91e625c4f14412ba8' 
  AND token = 'WGjnK53wZfS0sllHRqJOSU8pK937Iyxp45DsgL5odcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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