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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9979dc6f71001ce10039778fe88d5c323f409d51b3b6ae613928b27533c571b2' 
  AND token = 'AcD+aw6kAQZEfgGKdslVMb+Xxd4R1MrDdyaeosLjP58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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