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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dac220c7176fae3bd3c1873cdd67217344c642b8c0b33f9416d9bd1cb2acff77' 
  AND token = 'bVSiCi0vOkobi6C6V/pf8liqfJUjw2Qgk6g+i62CCDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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