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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0fdf60f20a3fdc1501cd6f2e396fa024dfc3dd6f4b04ab2e7df1a3addd1ec2d' 
  AND token = 'QpJMZftkuFPrM0Rd/IIB+MyuTkP2Wpvn+mXxT5PsnZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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