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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e0dfb076dcf62c2a29d3ab654c9867a25b642fb7647c6fc5dc17a00cf2a311c' 
  AND token = 'at/0cdge/owU96X4oZmp87EGL8nmT3mC2pavEPFMbFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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