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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91ee8d2a8144246416721734e48e2e13a0f694ae673ffec56eca10400b98cb92' 
  AND token = 'yWv1D6vc3g0ZLVfH2JHlQ4EYu2XVirfDfgj9qIBoSSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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