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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88fe62aa5447596a10636ec5d8c71e67c5783ad0dc547511ac845ed2849b968e' 
  AND token = 'WhIBznfAU2imsavssKAACE1Z00u4CULxSaA2b8yRItw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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