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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc163b05ab5266497bd7d1c0639682a95c577096a2a21b71ea34e0e3f10d456b' 
  AND token = 'TEPvmbPyshulnSzDhjUMOm0wFuggYSkoRmMhn+Rn2pY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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