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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fcffc51e725e6fa43390f84d10304a5be1a0f838b2ce230c26554a8697e0ae5' 
  AND token = 's7c/lwbpoT7zuCSBX2QZxtQFDRLs+FbeHHq6WAjbp1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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