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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d74cda2ffcdafb02b73cd070bc20add1f112ba428943856b91de2bf35c02cef' 
  AND token = 'S+w6ALnqdIpbJY1Wo8Lhk3lNASwLtOfiv08gBTVDB30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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