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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32a94a39d943dd4dbf302bcd99680d1f2df61a209521a0125625d3f4f14f6832' 
  AND token = 'yWXiK7LS1CtGvrSA7Q6YT68r1mk5MDKGXkGCc5eNJjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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