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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd2a5ed25136408581f5bac72e0974621b1fd2171cdebabe2f19443885a88b80' 
  AND token = 'El3Ni02/c3fQgl9lnUxgDat5toP5R53dbSye3z+M0wY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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