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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e79dde5706ee0aaa167f5f465141572b927e51e600545a737f6118852554f930' 
  AND token = 'euD7Nv7iQiqbg36Oa3ivbpXKaGoPNf4h/KFMolJAEOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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