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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcd5dbb9505840ae017480cc8eafc89ff5c3724db00c3c3f4e19657e815a71a4' 
  AND token = 'p++wgmqegK3piq7paVpnyWX33a00T0CdElVA8w6aN/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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