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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d97d979201a0272db72a976a241691d3d19eadd00f18d596ea629bb2927b98e' 
  AND token = '7J/VlxyrpogvGApmGdYoRR6DAQEFjYx9w0jOmN8Yk+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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