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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8fb195dd0f66e215e4e969697be5cb590dfe4d503bd10b4baa05eb62d677f3b' 
  AND token = 'f0QkvZwivu9mc0BIaShgBD5KD//RgYoz/FankDaqeaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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