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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3145cbb9850cdb2dbeadbdd2c10befedc5e620b074ad533e285472b9e0b92b09' 
  AND token = '6UL61jsy5CtM6s8OEr64diosnBXoVNTf5kskeXhOwWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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