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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7146e3300603b4b19c48fbb64c79147a2237a9035967b8df7d4703f59c3510c' 
  AND token = 'nBeW8oJ4xGar2g6QHLHDNXkROIwtBr+TK56Epb66JgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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