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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '932fd54029390f7a6ed73831aa3887542db650326fe8378d990911014181fc5d' 
  AND token = 'n1efb/3hLUa5xHHUkEbDC6ka8/lVA5vPbANVqCA2kpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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