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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30dc15a18575d74b4dd6474d3cf28be9cedf3153cc8c6c7401562359510d1bab' 
  AND token = 'bU4+Wyd8/84TtMt+iu5UWbn2DNGAq4WFX+sTSuZKEwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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