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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '585de2cd122edee1faf4ea450f3f08fe79c40cf3f284b27097b1c9f539b8c120' 
  AND token = 'v1QYg7Aw7S4xnT9CeV0oDh2QPF+fT0v42J1okBqYPk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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