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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e560ae2f71faac5641ba06d99cdfc6beb83596e6fab0d6317f0b812d6812421a' 
  AND token = 'PtdRxJetIEi9LIROns0IsJmTMDxNnZLiTz0d6/OFiz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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