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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74af2c236b581ff1d19ed4fbe35a2cb75d1d25ba37f0023a4d76593cfb7615c5' 
  AND token = '879jAuvX1U23bhianfHl1e/w6K39DBxDnkS0ELv4IeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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