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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3c44d92410c07612d3df67244f62e84ef408594582313c2814c7574d03eac6a' 
  AND token = 'A/e2PI32ZhIV5S3N4DIj2nJVFr0PTskcWlfETrrUI9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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