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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd2a601c6aa102b85b6e5820b2b3633c02d2ba30c5e55aa81abe75713473e6d9' 
  AND token = 'xS8W1VMPaVb1KcOJY4dYL1YjE2tMZAbjrRRc8AJK+qE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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