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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c969960af3f34116f4e5d2f796bd884d5174e38df10116c68b6169f775a3bc6' 
  AND token = 'h3XT/isV5M2iYs5VOkHlZVjIpiT3eHT01FL/15PViwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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