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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0273b4a0308746bd8beb5aaa204bec34f7b696188041eecc132e069f0030479d' 
  AND token = '7cWPMm9djBqYkdhltxd0Dl4vQLCkLU8M5GcbuevsRiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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