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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7de03e434fa7596a2e16a7f95b3b872d09872945ef5c1288eae0243da0857b63' 
  AND token = '9YSRr1ljNFa192SEmuRdBOFrQ8XD0cVGA4KI+2v1SPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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