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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b041bb48ac070f43da0578fb075f7cb4a449a9e3d5476766533d57106a7b3576' 
  AND token = 'Psoiqbpc21Cx1YHIenaNWHDQ6/isopVkLG7p2G9/mWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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