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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e1abba98d7d38f8ff899b1d1b1391830af0762dc9539e253f1e74cc58b025fe' 
  AND token = 'ui8I89mQZI2TLQfcXfPUZe36jd/ihfEhbxmhujZS+1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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