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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b00bc485a2d53ab7322ea3f0c078851eddb84ccd76c0a7148ed9a9eda0e0083e' 
  AND token = '/6GuVGypBGEWT4d93FdpdWBdnyULL2m19/8/4c3Px70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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