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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5829770486f3f9dc176817a018b231aa6b0a890d59a0c5d36dab36f361463eb' 
  AND token = 'o9mqFtCOyGjz+qLbvMulrpwxob3jH/03zjTlwbr60m4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00079

JSON explain

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