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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d2cdb6e701978d19fae78752f0516c2a1d93be2132a669b190ee9994aff5c0a' 
  AND token = 'D5S4o/uaytUVrtlNP/Wlsga3Nsc/Pc1QT1+LZH8DrVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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